If I remember correctly, the 1959 Spahn had a "1921" and a "1931" version, so if there is a version where the "3" is blocked out, that tells me that it is another variation, or some sort of interim correction of the original error. It is not just a fluke that the block out happens to appear over the same number of which there are two known variations. This one is legit.
Tom C
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